154 MONOGRAPH OF THE GENUS SCIURUS. 



animalcules, of a few lines in length, in the shell of a living 

 argonaut, — then, on the following day, finding them consi- 

 derably increased in size, — two or three days after not find- 

 ing any in the shell, — again, upon re-examining the parent 

 shell five or six days afterwards, and finding therein a very 

 young poulp with its little shell, both perfectly formed ; — and 

 having several times repeated these observations on other ar- 

 gonauts, and always finding the vermiculi before observing 

 the little poulp, — I was led to the conclusion that the vermi- 

 cule became transformed into a poulp. Having, moreover, 

 shown these vermiculi to some savans, who affirmed them to 

 be what I conjectured, viz., young poulps, I became the more 

 persuaded of it, and no longer took care to observe the ova 

 themselves. This year, however, T have made the following 

 observations on the progressive developement of the poulp of 

 the argonaut. The egg is at first white and transparent, and 

 no structure can be discerned in it. Fifteen days after the 

 egg presented some spots of a beautiful red colour, without 

 anything more. In ten days more the perfect poulp could be 

 discerned through the epidermis of the egg. Then the poulp 

 began to break through this involucrum, and appeared 

 to the naked eye of an elliptical form, with the eyes and 

 mouth ; a very transparent membrane is also observed, which 

 forms the mantle. Towards the mouth some small and al- 

 most imperceptible filaments are to be observed, which I sup- 

 pose to be the rudiments of the branchiae. The poulps are 

 now naked, but in twelve days from this time, on visiting them 

 again, some were found which had already formed their shell, 

 and the parent retained them and nourished them with her 

 gelatinous secretion, as I have already described in my Me- 

 moir inserted in the 12th vol. of the 'Transactions of the 

 Gioenian Academy.' " 



Art. T-T. — Monograph of the Genus Sciurus, with Descriptions of 

 New Species and their Varieties. By J. Bachman, D.D., Presi- 

 dent of the Literary and Philosophical Society, Charlestown, South 

 Carolina, &c. 



{ ( Continued from Page 123^. 



2. Texian Squirrel. Sciurus Texianus, (n. s.) 



In the Museum at Paris I observed a species of squirrel of 

 which I can find no description. It was said to have been 

 received from Mexico. In the Museums of Berlin and Zu- 



